Question: Who was the head of state for Tenochtitlan on December 3, 1520?
Paraphrase: On December 3rd 1520 who presided over Tenochtitilan
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q13695 p:P35 ?s . ?s ps:P35 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1520')) }